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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.webbeans.context;

import java.io.*;
import java.lang.annotation.Annotation;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentMap;

import javax.enterprise.context.ContextNotActiveException;
import javax.enterprise.context.spi.Context;
import javax.enterprise.context.spi.Contextual;
import javax.enterprise.context.spi.CreationalContext;

import org.apache.webbeans.container.SerializableBean;
import org.apache.webbeans.container.SerializableBeanVault;
import org.apache.webbeans.context.creational.BeanInstanceBag;

/**
 * Abstract implementation of the {@link Context} interfaces.
 * 
 * @see javax.enterprise.context.spi.Context
 * @see RequestContext
 * @see DependentContext
 * @see SessionContext
 * @see ApplicationContext
 * @see ConversationContext
 */
public abstract class AbstractContext implements Context, Serializable
{
    private static final long serialVersionUID = 2357678967444477818L;
    /**Context status, active or not*/
    protected volatile boolean active;


    /**Context contextual instances*/
    protected Map, BeanInstanceBag> componentInstanceMap = null;

    /**Contextual Scope Type*/
    protected Class scopeType;
    




    @SuppressWarnings("unchecked")
    private  void createContextualBag(Contextual contextual, CreationalContext creationalContext)
    {
        BeanInstanceBag bag = new BeanInstanceBag(creationalContext);
        
        if(componentInstanceMap instanceof ConcurrentMap)
        {
            T exist = (T) ((ConcurrentMap) componentInstanceMap).putIfAbsent(contextual, bag);
            //no instance
            if(exist == null)
            {
                componentInstanceMap.put(contextual, bag);
            }
        }
        else
        {
            componentInstanceMap.put(contextual, bag);
        }                
    }
    
    /**
     * Creates a new context with given scope type.
     * 
     * @param scopeType context scope type
     */
    protected AbstractContext(Class scopeType)
    {
        this.scopeType = scopeType;
        setComponentInstanceMap();

    }

    /**
     * {@inheritDoc}
     */
    @Override
    @SuppressWarnings("unchecked")
    public  T get(Contextual component)
    {
        checkActive();

        BeanInstanceBag bag = componentInstanceMap.get(component);
        
        if(bag != null)
        {
            return (T) bag.getBeanInstance();
        }
        
        return null;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public  T get(Contextual contextual, CreationalContext creationalContext)
    {
        checkActive();
        
        return getInstance(contextual, creationalContext);
    }

    /**
     * {@inheritDoc} 
     */
    @SuppressWarnings("unchecked")
    protected  T getInstance(Contextual contextual, CreationalContext creationalContext)
    {
        T instance;
        
        //Look for bag
        BeanInstanceBag bag = (BeanInstanceBag)componentInstanceMap.get(contextual);
        if(bag == null)
        {
            createContextualBag(contextual, creationalContext);
            bag = (BeanInstanceBag)componentInstanceMap.get(contextual);
        }

        //Look for instance
        instance = bag.getBeanInstance();
        if (instance != null)
        {
            return instance;
        }

        else
        {
            if(creationalContext == null)
            {
                return null;
            }
            
            else
            {                
                instance = bag.create(contextual);    
            }
        }

        return  instance;
    }

    /**
     * Destroy the given web beans component instance.
     * 
     * @param 
     * @param component web beans component
     * @param instance component instance
     */
    private  void destroyInstance(Contextual component, T instance,CreationalContext creationalContext)
    {
        //Destroy component
        component.destroy(instance,creationalContext);
    }
    
    /**
     * {@inheritDoc}
     */
    @SuppressWarnings("unchecked")
    public void destroy()
    {
        Set, BeanInstanceBag>> entrySet = componentInstanceMap.entrySet();
        Iterator, BeanInstanceBag>> it = entrySet.iterator();

        Contextual contextual;
        while (it.hasNext())
        {
            contextual = it.next().getKey();
            
            BeanInstanceBag instance = componentInstanceMap.get(contextual);
            //Get creational context
            CreationalContext